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I'm trying to achieve the following with my RPi3:

  • Static eth0 IP. This connects to my car's infotainment system.
  • DHCP wlan0 IP. This is for the RPi3 to connect to my home Wifi while the car is in the garage
  • Both eth0 and wlan0 must be up at the same time
  • I have no need to route traffic from the car's infotainment system through the RPi to Wifi or vice-versa (actually I want to prevent this)

My current situation is, with the /etc/network/interfaces file below, the wlan0 is working fine, but eth0 has no IP address and is unusable.
When I add "inet" to the iface eth0 configuration line, eth0 gets the static IP address, but wlan0 ceases to work. The wlan0 IP assigned to RPi by Wifi equipment is 192.168.1.20; netmask is 255.255.255.0.

auto lo iface lo inet loopback auto eth0 iface eth0 static address 192.168.42.1 netmask 255.255.255.0 # Car's infotainment IP 192.168.42.3 allow-hotplug wlan0 auto wlan0 iface wlan0 inet dhcp wpa-conf /etc/wpa_supplicant/wpa_supplicant.conf
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2 Answers 2

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What you have has a number of errors, and would not have worked.

Indeed the proper configuration would NOT have enabled both interfaces simultaneously. dhcpcd will configure both (if correctly setup).

See How do I set up networking/WiFi/Static IP

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What worked for me (can communicate with Pi from eth side and wlan side):

/etc/network/interfaces

auto wlan0 auto lo iface lo inet loopback allow-hotplug eth0 inet eth0 inet manual allow-hotplug wlan0 iface wlan0 inet manual

/etc/wpa_supplicant/wpa_supplicant.conf:

network={ ssid="MYSSID" key_mgmt=WPA-PSK proto=RSN psk="MYPSK" }

/etc/dhcpcd.conf (using 192.168.42.2 as Pi IP and 192.168.42.1 as Car IP)

interface eth0 static ip_address=192.168.42.2/24 static routers=192.168.42.1 static domain_name_servers=192.168.42.1 8.8.8.8 interface wlan0 static ip_address=undefined/24 static routers=undefined static domain_name_servers=undefined 8.8.8.8
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